题目

阅读下面短文，从短文后所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。 I was tired andhungry after a long day of work. When I walked intothe living-room, my 12-year-old son 1 upat me and said, I love you. I didn't know what to say. For several 2 all I could do was to 3 there and look at him. My first thought wasthat he must need 4 with his homework or he was trying to 5 mefor some news.Finally I asked, What was thatall about? Nothing,he said. My teacher said we should 6 our parents that we love them and sees whatthey say. It's 7. The next d设n为正整数，则12[（-1）n+（-1）n+1]的值为（　　）A．2B．-2C．12D．0